Mechanical hoist



F. E. ACKERMAN.

MECHANICAL HOIST.

APPLICATION FILED Aue.2s.,,I-92I.

1,423,638., 4 I Patented uly 25, 1922.

III IIWII III" I ""IIIII l UIIIII FRANK E. AOKERMAN, OF ST PAUL, MINNESOTA.

i MECHANICAL HOIST.

T Q all whom it may concern;

Be it known that I, FRANK E. AoKnRMAN, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Mechanical Hoists; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as will enable others skilled'in the art to which it appertains to make and use the same.

My. presentinvention' has for its object to provide an extremely simple and highly etlicient mechanical hoist intended for general use. but especially adapted for use in connection with dumping vehicles.

To the above end, generally stated, the invention consists of the novel devices an combinations of devices hereinafter described and defined in the claims.

,In the accompanying drawings which illustrate the invention like characters indicate like parts through out the several views.

Referring to the drawings:

Fig. 1 is a fragmentary side elevation of adumping vehicle in the form of a dumping vehiclein the form of a dumping truck having the invention embodied therein, some parts being indicated by means of broken lines and other parts being indicated in dif ferent positionsby means of broken lines;

Fig; 2 is a planview of the parts shown in Fig. 1, with the truck body removed, oer-- tain of said parts being indicated in different positions by means of broken lines;

Fig. 3 is a transverse section taken on a line 3-:3 of Fig. 1;

Fig. 4 is a detail view with some parts sectioned on the line 4-4 of-Fig. 2, on an enlarged scale and Fig. 5 is a fragmentary detail view partly in plan and partly in horizontal section, takenon the line 5-5 ofFig. 4.

Of th e parts of the dumping truck illus trated it is important to note the main frame 6, rear wheel? and dumping body 8 mountedon a supplemental frame 9 which in turn is pivoted at 10 to said main frame.

A transverse rock shaft 11 is jonrnaled in a bearing plate 12 and a bearing 12 secured tosthe main frame 6 and located forward of the pivots 10. Rigidly secured to the outer ends of the rock shaft 11 are parallel and normally depending crank arms 13, the outor ends of which are connected to the supplemental frame 9 by pivoted links 14.

Specification of Letters Patent. Patented July 25, 1922.

Application filed August 25, 1921, Serial No. 495,191.

These links 14 are pivoted to the supplemental frame 9, forward of the rock shaft 11, and when said'rock shaft is'given a onehalf rotation'to lift the dumping body 8, said links 14 and arms 13 are aligned, as in dicated by brokenlines in Fig. 1.

' Keyed to the rock shaft 11 is alarge spur gear 15 which meshes with an idle spur gear 16 journaled on a stub shaft 17 secured to the bearing plate 12. Rigi'dly secured to the pinion 16 for rotation therewith is a spur gear 18 which meshes with a spur pinion 19, loosely journaled on a stub shaft 20 secured to. the bearing plate 12. This pinion 19 is rigidly secured to an internal gear 21, having an intermediate radially disposed web 22in which are formed two diametrid cally opposite lock openings 23. The teeth of the gear 21 are formed entirely on-one side of the'web 22' except at the openin s 23, where they are extended therethroug Meshed with the internal gear 21 is a pinion 24 rigidly secured to an endwise moveable shaft'25 journaled on the'bearing plate 12 and a bearing arm 26 secured to said bearing plate.

At the outer end of the shaft 25 is a hand crank 27 by which said shaft, train of gears 15, 16, 17, 19, 21 and'24 and rock shaft 11 may be operated to raise and lower the dumping body Swhen the shaft is adjusted to cause'the pinion 24 to mesh with the internal gear'21 and the hand crank to clear the side of the dumping body 8 and respective rear tire 7, as shown by full lines in Fig. 2.

It is important to note that the pinion 24 is aligned with oneof the lock openings 23 in the web 22 of the internal gear 21 when thedumping body 8 is down, as shown by full. linesin Fig. 1. To look the dumping body 8 down, the shaft 25 is moved endwise, as indicated by broken lines in Fig. 2 to carry the pinion 24 through the respective lock opening 23. In this position of the pinion 24 the engagement of the web 22 with the shaft 25 will securely lock the dumping body 8 down. When the dumping body 8 is in a dumping position, as shown by broken lines inFig. 1, or in an intermediate dumping position the shaft 25 may be moved endwise into one of the lock openings 23 and thereby positively secure the dumping body 8 where set. A. strap loop 28 is secured to the supplemental frame 9 to hold the hand crank 27 up,asshown in Fig. 2, and in this ran position of said hand crank, the same is entirely under the dumpingbody 8 and out of the way. 7

To move the dumping body 8 into a dumping position it is only necessary to operate the hand crank 27 sufliciently to give the rock shaft 11 a one-half rotation and thereby bring the arms 13 from depending to upright positions in which they are aligned with the links 14:. l/Vhen the arms 13 and links 14 are aligned, a great deal of strain is removed therefrom and all danger of buckling eliminated. The arrangement of the pivots 10 and hoisting mechanism issuch as to require a minimum amount of power to operate the dumping body 8. The outer ends of the stub shaft 17 and 20 are con nected by a tire strap 29 which holds said shafts parallel. v

The above. described invention, while eX- tremely simple and of comparatively small cost to manufacture, is thought to be highlr efficient for the purpose had in mind.

What I claim is:

l. The combination with a vehicle having a dumping body, of a crank-shaft mounted on the vehicle and connected to the dumping body, and common means for operating the crank shaft to raise or lower the dumping body and for positively locking the same in a raised position. v

2. The combination with a vehicle having a dumping body, of a crank shaft mounted,

on the vehicle and connected to the dumping body, and common means for operating the crank shaft to raise or lower the dumping body and for positively locking the same in a lowered position.

8. The combination with a vehicle having a dumping body, of a crank shaft mounted on the vehicle and connected to the dumping body, and common means for operating the crank shaft to raise or lower the dumping body and for positively locking the same in a lowered or raised position.

at. The combination with a vehicle having a dumpingbody, on the vehicle and connected to the dumping body, and common means for operating the crank shaft to raise or lower the dumping body and for positively locking the same in .an extreme raised position or a predetermined intermediate raised position.

5. The combination with a vehicle having a dumping body, of a crank shaft and an endwise adjustable shaft mounted on the vehicle, connections from the crank shaft to the dumping body for raising or lowering the same, means for rotating the endwise movable shaft, and driving connections from the endwise adjustable shaft to the crank shaft including a co-operating gear and pinion, said endwise adjustable shaft being arranged when moved to one adjusted position to lock the gear against rotation.

of a crank shaft mounted 6. The combination with a vehicle having a dumping body, of a crank shaft and an endwise adjustable shaft mounted on the vehicle, connections from the crank shaft to the dumping body for raising or lowering the same, means for rotating the endwise movable shaft, and driving connections from the endwise adjustable shaft to the crank shaft including a co-operating gear and pinion, said endwise adjustable shaft being arranged, when moved to one adjusted position, to carry the pinion out of mesh with the gear and lock said gear against rotation.

7.' The combination with a vehicle having a dumping body, of a crank shaft and an endwise adjustable shaft mounted on the vehicle, connections from the crank shaft to I the dumping body for raising'or lowering the same, means for rotating the endwise movable shaft, driving connections from the endwise adjustable shaft to the crankshaft including a co-operating gear and pinion, and a hand crank on the endwise adjustable shaft, said endwise adjustable shaft'being' arranged, when moved to one adjusted position, to carry the pinion into mesh with the gear and position the hand crank outward of the dumping body and,when moved to an-' other adjustable position, to carry the pin ion out of mesh with the gear, lock said gear against rotation and position the hand crank under the dumping body.

8. The combination with a vehicle having a dumping body, of a crank shaft and an endwise adjustable shaft mountedon the vehicle, connections from the crank shaft to the dumping body for raising or lowering the same, means for rotating the endwise movable shaft, and driving connections from the endwise adjustable shaft to the crank shaft including a co-operating gear and pinion, said gear having a radially disposed.

web provided with a lock opening, said endwise adjustable shaft being arranged, when moved to one adjusted position, to project into said lock opening and thereby lock the gear against rotation.

9. The combination with a vehicle having a dumping body, of a crank shaft and an endwise adjustable shaft mounted on the vehicle, connections from the crank shaft to the dumping body for raising or lowering the same, means for rotating the endwise movable shaft, and driving connections from the endwise adjustable shaft to the crank shaft including a co-operating gear and pinion, said gear havinga radially disposed web provided with a lock opening, said endwise adjustable shaft being arranged, when moved to one adjusted position, to carry the pinion through said lockiopening and itself pro ect into said lock opening and thereby lock the gear against rotation.

an endwise adjustable shaft mounted on the vehicle, connections from the crank shaft to the dumping body for raising or lowering the same, means formotating the endwise movable shaft, and driving connections from the endwise adjustable shaft to the crank shaft including a co-operating gear and pinion, said gear having a radially disposed Web provlded with a lock openingysaid endwise adjustable shaft being arranged, when moved to one adjusted position, to carry the pinion through said lock opening and out of mesh with the gear and itself project into said lock opening and thereby lock the gear against rotation.

In testimony whereof I afiiX my signature.

FRANK E. ACKERMAN. 

